"Algae has been a hot topic of biofuel discussions recently, but until now, no one has taken such a detailed look at how much America could make and how much water and land it would require," said Mark Wigmosta, lead author of the study and a PNNL hydrologist. "This research provides the groundwork and initial estimates needed to better inform renewable-energy decisions."

Trina Solar will begin to sell modules in the U.S., Australia and Europe that are grooved to accommodate the low-cost racking system invented by Zep Solar -- one more tiny step in reducing the cost of solar.

In 2008, many economists were surprised by the rising prices of maize, rice, wheat and petroleum, all of which tripled in real terms. Prices came down, but ever since, it’s been a rocky road.

Blame part of it on an increase in demand and natural disasters. Floods in Australia, drought in Argentina, fires in Russia, and frost damage in the U.S. and Europe contributed to the spike in food prices in December 2010, according to the Food and Agriculture Organization (FAO). These events resulted in export bans and short-term speculation, causing riots and political instability in more than 30 countries worldwide.

But part of the problem derives from ethanol production. In the U.S., 40% of corn production from food and feed is used for ethanol fuel production, putting stress on corn supplies in a year when stocks are at the lowest level in decades. People living in the 52 high-risk countries -- 750 million of them already malnourished -- rely on 83 billion tons of imported food a year, much of it corn, soybeans and wheat exported by the United States.

Sprint has long been an innovation leader. It introduced the first fiber-optic cable and 4G network to the U.S. as well as eco-friendly cell phones. Cell phones are central to American youth -- 58% of 12-year-olds and 83% of 17-year-olds own mobile phones. Smart phones are replacing calculators, cameras, camcorders and books.

But most cell phones are made from toxic materials. Millions of used phones are causing environmental concern, as only 10% are recycled in the U.S. annually. It is estimated that 140 million end up in landfills, accounting for 65,000 tons of waste material. How could we tackle the problem? With green phones, says Sprint.